Many of us probably don’t work as hard as we could, but it’s not always easy to tell. The RPE (Rate of Perceived Exertion) scale helps with that. After all, sometimes fitness isn’t just about how much weight you lift, how many miles you run, or even how many calories you burn. It’s about how hard you can work during that weight lifting session, that run, or that spin class.
via Lifehacker http://ift.tt/1QGaWyk
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